Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1987-03-27
1987-11-17
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
H01H 3366
Patent
active
047075775
ABSTRACT:
An inventive vacuum interrupter has an improved dielectric strength and durability which leads to an improved interruption performance. The interrupter has a vacuum envelope comprising an insulating cylinder, a metal end plate hermetically sealed to one edge of the insulating cylinder, a bottomed metal cylinder with its open end hermetically sealed to the other edge of the insulating cylinder, and a metal bellows connected to the bottom of the metal cylinder. A stationary lead rod passes through the metal end plate and the insulating cylinder and terminates within the metal cylinder, an inner end of the stationary lead rod carrying a stationary electrode. A movable lead rod extends coaxially with the stationary lead rod, an inner end of the movable lead rod carrying a movable electrode. The movable lead rod is sufficiently longer than the stationary lead rod. The metal bellows is located outside of the metal cylinder and has an exterior exposed to the air and an interior exposed to the vacuum within the vacuum envelope. A coil producing an axial magnetic field in parallel to an arc current path formed between the electrodes when the electrodes are separated surrounds the electrodes outside of the metal cylinder.
REFERENCES:
patent: 3372258 (1968-03-01), Porter
patent: 3581142 (1971-05-01), Boxman
patent: 4039792 (1977-08-01), Crouch et al.
patent: 4431885 (1984-02-01), Sakuma et al.
patent: 4478347 (1984-10-01), Cherry et al.
patent: 4528432 (1985-07-01), Senba et al.
patent: 4661666 (1987-04-01), Sukuma et al.
Fukai Toshimasa
Sakuma Shinzo
Takihana Masatoshi
Tamaki Nobuaki
Kabushiki Kaisha Meidensha
Macon Robert S.
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